20 câu Trắc nghiệm Tiếng Anh 12 Cánh diều Chuyên đề 13: Động từ khuyết thiếu (Modal verb)
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His letter is full of mistakes. He________the mistakes carefully before sending it. A. must have checked B. could have checked C. should have checked D. can have checked

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His letter is full of mistakes. He________the mistakes carefully before sending it. 

must have checked

could have checked

should have checked

can have checked

Giải thích

Chọn đáp án C